See https://www.investopedia.com/how-to-find-lawmaker-investment... for the official disclosure portals, as well as some unofficial trackers.

They have to fill out a disclosure form, but it's on a 30 day delay, often more because they file late.

Be wary of all the third party congressional stock trackers for this reason.

https://unusualwhales.com/portfolios/pro-congress-etf

Unusual Whales keeps track of Congressional disclosures and even built ETFs around each party’s picks: https://unusualwhales.com/politics

It’s absolutely disgusting that this sort of Insider Trading has been allowed to continue unchecked, and a significant contributor to the normalization of American corruption and its associated regulatory capture.

By the time you factor in the information you're too late.

Ask one of them to lunch, slip them an envelope.